Differentiate $f ( x ) = \frac { x ^ { 2 } } { x - 6 }$

Multiple Choice

Differentiate: $f ( x ) = \frac { x ^ { 2 } } { x - 6 }$

A) 2x
B) -x
C) $\frac { 3 x ^ { 2 } + 12 x } { ( x - 6 ) ^ { 2 } }$
D) $\frac { x ^ { 2 } - 12 x } { ( x - 6 ) ^ { 2 } }$